Overview

The O.S. Engine 25FX II is a high performance side exhaust aero engine that is suitable for many styles of small R/C aircraft such as sport, scale, aerobatic and even .25 class pylon racers.

The 25FX II uses a direct needle 21L carburettor for excellent usability and a 892 silencer with adjustable exhaust direction.

O.S.'s legendary standard of build quality is evident throughout.

Specifications

• Weight: 260g (9.17oz)
• Capacity: 4.07cc (0.248 cu.in.)
• Bore: 18mm (0.709")
• Stroke: 16mm (0.630")
• Power Output: 0.84 ps (0.83 hp)
• Practical RPM: 2,500 - 19,000